Sash-lifter.



F. J. ODERMATT.

SASH LIFTER.

APPLICATION 11,111) JULY 21, 1011.

1,019,690. Patented M21115, 1912.

' Suva/41oz E J Odermafif.

wi/immeo awn-Mu:

UNITED STATES PATENT OFFICE.

FRANK J'. ODERMATT, F TUCSON, ARIZONA.

SASH-LIFTER.

T 0 all whom it may concern:

Be it known that I, FRANK J. ODERMA'LT, a citlzen of the United States,residing at Tucson, 1n the county of Plma and State of Arizona, havelnvented certain new and use A i'ul Improvements in Sash-Lifters, ofwhich the following is a specification.

My invention relates to improvements in sash lifters, and has for itsobject the provision of an improved device which may be readily securedto an ordinary window frame and which will serve to take the place of acustomary sash weight or balances in facilitating the raising orlowering of the window and holding the same in any desired adjustedposition.

The further object of'my invention is the provision of an improveddevice of this character which may be secured in position in a windowframe and which will thus eliminate the necessity of forming the doublestile to provide a passage in which the usual sash weight or balance maymove.

Another object of my invention is the provision in a sash lifting deviceof an improved form of spring pressed drums for winding up the sash cordor cable and of improved novel means for braking or controlling themovement of the drum to cause the window to remain at all times in adesired adjusted position, and yet to cause the drum to automaticallywind up the sash cord or cable when the window is lifted.

Other objects and advantages of my improved sash lifter will be readilyapparent by reference to the following description taken in connectionwith the accompanying drawings, and it will be understood that I maymake any modification in my structure shown and described within thescope of my claim without departing from or exceeding the spirit of myinvention.

In the drawings, Figure 1 represents a fragmentary View of an ordinarywindow equipped with my improved sash lifting device, Fig. 2 representsa plan view of the said device with the inclosing casing thereforremoved, Fig. 3 represents a side elevation of the device as shown inFig. 2, Fig. 1 represents a perspective view of the axle pin of myinvention, illustrating the means for adjusting the tension of thespring carried thereby, and Fig. 5 represents a perspective view of thecam brake member for engaging the winding wheel or drum of my invention.

Specification of Letters Patent.

Application filed July 21, 1911.

Patented Mar. 5, 1912.

Serial No. 639,772.

In the drawings, the numeral 1 designates the stiles oil the windowhaving the ordinary grooves or guideways 2 formed therein for the sidesof the window sashes 3, while extending upward from the top of thewindow sash stiles are the sash cords l, said parts being of customaryconstruction.

Secured to the top of the stile 1 of the window casing are the baseplates 5 of my invention, while secured upon and rising from each of thebase plates 5 is the dome or casing G which inclose the operating partsof my invention, an axle member 7 being rotatably mounted centrally ofthe sides of the dome or casing and extending across the space includedby the casing. Said pin has the slot 8 formed in one end thereof andextending diametrically thereof, while formed in the sides of the axlepin are the recesses 9 adapted to engage the ends of the blade spring 10which is secured to the exterior of the casing, the engagement of theend of the spring in the recesses 9 being such as to permit of theturning of the axle pin in one direction but preventing of its reverseturning. Rotatably engaged upon the said axle pin 7 and located withinthe casing 6 are the hubs 11 having the radiating spokes 12 which aresecured to the side flanges 13 of the sash cord or cable winding drum14, it being understood that if desired the said winding drum, spokesand hub may be cast or formed in a single piece. Mounted upon the axle 7and having one end secured thereto is the coil spring 15 which has itsother end secured to the inner face of the winding drum 14, the turningof the axle 7 by engagement of a screwdriver or similar tool in the slot8 in its end serving to wind up the said spring, the blade spring 10acting as a pawl to lock the axle with the spring wound under suitabletension.

From the foregoing description taken in connection with the accompanyingdrawings the. construction of my improved sash lifter will be readilyunderstood, and it will be seen that the spring tends to rotate the drum14 to wind the sash cord or cable thereon and thus to hold the windowsash in raised position. In order that the window sash may remain in thedesired position and to prevent the spring from moving the sash upwardwhen it is desired to have the window open, I rotatably mount on theaxle 7 the cam shaped washer 16 having the inwardly extendingsubstantially triangular shaped lug portions 17 which are adapted tolockingly engage the spokes 12 of the winding drum as said drum is movedto unwind the sash cord therefrom. A disk spring 18 is mounted upon theaxle? and has one end bearing against the casing and the other endbearing against the outer face of the washer 16 to force the lugportions 17 of the said Washer into tight engagement with the spokes. Tocause the said cam washer to act as a brake against automatic windingmovement by the drum 1-1, I secure to the base plate 5 one end of theheavy blade spring member 19 which is bent to extend upward and bearagainst the periphery of the cam washer, whereby the said spring willtend to hold the cam washer against accidental rotation and to lock thesame in any position to which it may be pushed by the lowering of thewindow sash and the consequent unwinding of the drum 14. It will thus beseen that when the cord is unwound from the drum 14 the braking actionof the cam washer 16 in connection with the weight of the window sashwill be suflicient to prevent the drum from being turned by the springto wind the cord thereon thus to raise the window and prevent the windowfrom staying in desired adjusted position. lVhen it is desired to shiftthe sash upward, however, as the person grasps the sash to raise thesame the strain of the weight of the sash will be taken off of the sashcord, when the tension of the spring 15 will be sufficient to rotate thedrum 14 and wind up the sash cord thereon, the spokes riding against thebeveled faces of the lugs 17 and forcing the braking washer 16 outwardagainst the tension of the disk spring 18, whereby the said braking diskwasher 16 remains held in position by the spring 19 while the drum 14;rotates independently thereof.

To prevent the sash cord from binding against the casing as it islifted, I preferably pass through the casing the pivot pin or rivet 20on which is mounted the guide sheave 21 over which the sash cord passesas it enters the casing, said guide sheave 21 serving to guide the sashcord on to the sash drum let and to prevent the said sash cord frombinding against the edges of the easing.

It will thus be seen that I have provided a thoroughly simple andeflicient sash lifter in which the tension of the operating spring maybe readily adjusted, and which is provided with an improved form ofbrake of such nature as to allow of the placing of the window sash inany desired adjusted position and prevent the winding drum from movingthe sash from said adjusted position, while releasing the drum uponshifting of the sash to allow the drum to wind up the loose sash cord.

I claim:

A. sash lifter, comprising a base plate, a casing secured to and risingfrom the base plate, an axle rotatably engaged in the sides of thecasing, and having recesses formed in one of its ends, a pawl device forengaging the recessed end of the axle to hold the same against rotationin one direction, a shell winding drum including spokes mounted upon theaxle, a spring coiled on the axle and having one end secured to the axleand the other to the drum, the rotation of the axle serving to adjustthe tension of the said spring, a sash cord having one end secured tothe winding drum, a cam washer rotatably mounted upon the axle adjacentone side of the drum and having inwardly extending beveled lugs adaptedto grippingly engage the spokes of the drum upon rotation of the same inone direction, a spring for holding the cam washer in engagement withthe drum, and a resilient brake having one end secured to the baseportion and its other end engaging the periphery of the washer forresisting rotative movement thereof.

In testimony whereof I aflix my signature, in the presence of twowitnesses.

HARRY E. SHEPARD, THOMAS W. CAR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

